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      Elev 112 ft, 38.992 °N 76.970 °W

      Adelphi, MD

      Cool Spring Terrace Station89°
      Updated: 10:30 AM EDT on September 18, 2026 (GMT -4)
      7 minutes ago
      85°
      69°
      89
      Feels Like 102
      Partly Cloudy
      N
      9
      Similar temperature is expected today
      50
      50
      575
      90
      50
      7
      0 mph
      50
      50
      50
      50
      50
      50
      Radar · Now
        Hyper-local data from Weather Underground's network of
        400,000+ personal weather stations worldwide
        Today
        Fri 09/18
        High 85°f
         15% Precip. / 0 in
        Mostly cloudy. Slight chance of a rain shower. High around 85F. Winds N at 5 to 10 mph.
        Tonight
        Fri 09/18
        Low 63°f
         2% Precip. / 0 in
        Partly cloudy skies. Low 63F. Winds NNE at 5 to 10 mph.
        Tomorrow
        Sat 09/19
        High 79°f67°f
         2% Precip. / 0 in
        Intervals of clouds and sunshine in the morning with more clouds for later in the day. High 79F. Winds ENE at 5 to 10 mph.
        Hourly Forecast
        Now
        82°
        11AM
        83°
        12PM
        84°
        1PM
        84°
        2PM
        83°
        3PM
        82°
        4PM
        83°
        5PM
        82°
        6PM
        82°
        7PM
        80°
        7:11PM
        Sunset
        8PM
        78°
        9PM
        75°
        10PM
        73°
        11PM
        72°
        12AM
        71°
        1AM
        70°
        2AM
        69°
        3AM
        68°
        4AM
        67°
        5AM
        66°
        6AM
        65°
        6:52AM
        Sunrise
        7AM
        64°
        8AM
        66°
        9AM
        68°
        10AM
        71°
        Precipitation
        15%
        Pollen
        Ragweed Pollen
        High
        Air Quality
        54
        Moderate
        UV Index
        3
        Moderate
        Additional Conditions
        1. Pressure 30.08 in
        2. Visibility 10 miles
        3. Clouds Partly Cloudy
        4. Dew Point70°F
        5. Humidity 66%
        6. Rainfall 0.36 in
        7. Snow Depth 0 in
         KCGS Station History
        Almanac for September 18, 2026
        1. Forecast Average Record
        2. Temperature
        3. High 85°F 79°F 98°F 1991
        4. Low 69°F 59°F 37°F 1937
        5. Rain/Snow Depth
        6. Precipitation 0 in 0.14 in -
        7. Snow 0 in - in -
        Almanac for September 19, 2026
        1. Forecast Average Record
        2. Temperature
        3. High 79°F 79°F 97°F
        4. Low 69°F 59°F 38°F
        Astronomy
        1. Sun Rise Set
        2. Actual Time 6:52 AM 7:11 PM
        3. Civil Twilight 6:25 AM 7:37 PM
        4. Nautical Twilight 5:53 AM 8:09PM
        5. Astronomical Twilight 5:21 AM 8:41 PM
        1. Length of Visible Light 13h 12m
        2. Length of Day 12h 19m
        3. Tomorrow will be 2 minutes 30 seconds shorter
        1. Moon 2:37 PM 11:29 PM
        2. First Quarter49% of the Moon is Illuminated
        Sep 18
        Waxing Half First Qtr
        Sep 26
        Full Moon
        Oct 3
        Waning Half Last Qtr
        Oct 10
        New Moon
        Precipitation
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